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Many organizations use a common management technique called management by objectives (MBO). MBO is not covered directly in the PMBOK, but you will need to understand its general concept for the PMP exam. In very simple terms, MBO helps ensure that objectives within various areas or levels within an organization agree, or harmonize, with objectives from other areas and levels. In short, MBO gets everyone thinking with an enterprisewide perspective.
The project initiation process group is really a set of activities that directly support MBO techniques. The main purpose of project initiation is to ensure projects are understood, provide value to the organization, and are fully authorized by the organization.